import type { FontResult } from "./types.js";
/**
 * Font registry to track loaded fonts and prevent duplicates
 */
declare class FontRegistry {
    private fonts;
    private cssInjected;
    register(key: string, result: FontResult): void;
    get(key: string): FontResult | undefined;
    has(key: string): boolean;
    markCSSInjected(key: string): void;
    isCSSInjected(key: string): boolean;
}
export declare const fontRegistry: FontRegistry;
/**
 * Create a font result object
 */
export declare function createFontResult(family: string, className: string, variable?: string, weight?: number, style?: string): FontResult;
/**
 * Generate a cache key for a font configuration
 */
export declare function generateFontKey(family: string, options: Record<string, any>): string;
/**
 * Inject CSS into the document (client-side only)
 */
export declare function injectCSS(css: string, id: string): void;
/**
 * Generate a unique ID for CSS injection
 */
export declare function generateCSSId(family: string): string;
/**
 * Format font family name (e.g., "Roboto Mono" -> "Roboto_Mono" for function names)
 */
export declare function formatFontFunctionName(family: string): string;
/**
 * Parse font family from function name (e.g., "Roboto_Mono" -> "Roboto Mono")
 */
export declare function parseFontFamily(functionName: string): string;
/**
 * Validate font display value
 */
export declare function validateDisplay(display?: string): "auto" | "block" | "swap" | "fallback" | "optional";
/**
 * Validate and normalize weights
 */
export declare function normalizeWeights(weights?: number[] | "variable"): number[] | "variable";
/**
 * Normalize subsets
 */
export declare function normalizeSubsets(subsets?: string[]): string[];
/**
 * Check if we're running in a browser environment
 */
export declare function isBrowser(): boolean;
/**
 * Check if we're running on the server
 */
export declare function isServer(): boolean;
export {};
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